I am already on Seroquel and we've been talking about adding Lithium. Although I've had times where I've felt too numb on medication, lately I actually need something to flatten out my moods a little more. For a little while, I attempted to lower my Seroquel dose for side effects reasons. However, it was really de-stabilizing, so my pdoc increased it again. I can still use a little more help to level me out, so maybe Lithium will do it for me.
I really do hope it won't flatten my moods too much though to the point where it has that zombie effect, but right now I am kind of desperate for relief.

Edit: sorry I forgot to quote both your reply and Guinness's comment leading up to that.